coaching is really just 35% of the job. The rest is NIL, recruiting, alumni management, etc. We don't know how he is going to do with that, and with the fact that his team members now can quite literally leave at any moment for any reason and go to a competitor. No promise of continuity. How will he maintain his team? We don't know.
Like I said, he's an unknown. We don't know how he'll do in a non-NBA environment.